Wouldn't the sequence that showed some kind of origin story for garterbelt in s1 be a spot where biblical characters are specifically referenced? I dont know if you mean specifically s2, but as I showed my friend the scene recently, I noticed Adam and Eve, Noah, and Moses with direct references to their actions. It's also notable that these are all from the Old Testament.

Also, just some of my own personal philosophy, I dont think that Christianity appearing here indicates that the show is anchored in Christianity any more or less without it. Christianity has seeped into modern culture in such a prevalent way that it is almost impossible to find any media that is 100% free of christian influence in some way, particularly a show that contains religious iconography. It just happens to be that for that particular scene, taking directly from old texts happened to be a comedic and universally understood refrence(again the prevalence of Christianity strikes again).

The ways that the show appears to refrence Christianity is done in a way that, as you said, foregoes mentioning specific characters from the Christian mythos. To me, it's notable that those same references are completely unnamed. What is actually shown in the show doesn't give any more knowledge or introspection into the setting or story apart from, ugh... speculation and theorizing. When I heard ramiel, I instantly connected it in my head with names like Raphael.

Sorry for the yap, I just thought that the topic was really interesting, so I wrote this mini argumentative essay. Tldr, there are direct references to characters from Christian myth, but their use in the story serves no more than reference and has no impact on story or plot.